road and track called sentra an economy car minus the look and feel of an economy car. wonder how civic and corolla look and feel about that. the all-new nissan sentra, with best-in-class mpg. lease for $169 per month. visit choosenissan.com. >>> it's official. 2012 was the hottest year on record for the continental u.s. the national oceanic and atmospheric administration announced that last year -- rather that last year easily beat the previous hottest year. that was 1998. it got the new record. this comes as a new federal report makes it official. climate change has already started to impact american people and the economy. well, joining me now is coral davenport, energy and environment correspondent for the national journal. good to see you again. just how hot was it last year? >> alex, the average annual temperature in the u.s. last year was 55.3 degrees. that was about -- that was a degree higher than the last previous record. it was 3.2 degrees higher than the average record -- than the average temperature for the 20th century. another way to think about the tempe